feat(expense): add persistent zero-entry receipt association

server/tests/test_migration_preflight.py

@@ -48,7 +48,7 @@ def test_unversioned_database_without_migration_owned_tables_is_safe(engine: Eng
 
 @pytest.mark.parametrize(
     "owned_table",
-    sorted(MIGRATION_OWNED_TABLES_BY_REVISION["20260714_0005"]),
+    sorted(MIGRATION_OWNED_TABLES_BY_REVISION["20260716_0006"]),
 )
 def test_unversioned_database_with_any_migration_owned_table_is_rejected(
     engine: Engine,
@@ -100,6 +100,11 @@ def test_known_revision_requires_and_accepts_its_exact_owned_table_set(
             "20260714_0005",
             MIGRATION_OWNED_TABLES_BY_REVISION["20260714_0005"] - {"memory_entries"},
         ),
+        (
+            "20260716_0006",
+            MIGRATION_OWNED_TABLES_BY_REVISION["20260716_0006"]
+            - {"attachment_association_jobs"},
+        ),
     ],
 )
 def test_known_revision_with_missing_or_unexpected_owned_tables_is_rejected(